JavaScript RegExp ?! Quantifier

Do a global, case insensitive search for "is" not followed by " all":

let text = "Is this all there is";
let pattern = /is(?! all)/gi;

Description

The ?!n quantifier matches any string that is not followed by a specific string n.

Tip: Use the ?=n quantifier to match any string that IS followed by a specific string n.

/(?!n)/ is an ECMAScript1 (ES1) feature.

ES1 (JavaScript 1997) is fully supported in all browsers:


Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	Yes

new RegExp("regexp(?!n)")

or

/regexp(?!n)/

new RegExp("regexp(?!n)", "g")

or simply:

/regexp(?!n)/g